Loans (Nonaccrual and Past Due Loans) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Jun. 30, 2020	Jan. 01, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Nonaccrual	$ 26,436	$ 26,436			$ 17,781
Financing Receivable, 90 Days or More Past Due, Still Accruing	2,815	2,815			3,932
Financing Receivable, Nonaccrual, Interest Income	377	1,200
Financing Receivable, Nonaccrual, No Allowance	$ 1,300	$ 1,300			$ 3,100
Percent of Loans Considered Current	99.20%	99.20%			98.60%
Accounting Standards Update 2016-13 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing					$ 3,900
One Commercial relationship [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Nonaccrual	$ 1,800	$ 1,800
Financing Receivable, 90 Days or More Past Due, Still Accruing	1,500	1,500
Commercial real estate, other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Nonaccrual	4	4			411
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0			0
Financing Receivable, Allowance for Credit Loss	2,514	2,514	$ 2,662	$ 600
Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Nonaccrual	9,534	9,534			6,801
Financing Receivable, 90 Days or More Past Due, Still Accruing	80	80			907
Financing Receivable, Allowance for Credit Loss	19,035	19,035	19,148	7,193
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Nonaccrual	6,317	6,317			2,155
Financing Receivable, 90 Days or More Past Due, Still Accruing	74	74			155
Residential real estate | Two Commercial relationships [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Nonaccrual	3,300	3,300
Home equity lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Nonaccrual	8,508	8,508			6,361
Financing Receivable, 90 Days or More Past Due, Still Accruing	2,548	2,548			2,677
Home Equity Line of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Nonaccrual	919	919			1,165
Financing Receivable, 90 Days or More Past Due, Still Accruing	27	27			108
Financing Receivable, Allowance for Credit Loss	1,797	1,797	1,755	1,570
Consumer, direct
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Nonaccrual	961	961			840
Financing Receivable, 90 Days or More Past Due, Still Accruing	86	86			0
Financing Receivable, Allowance for Credit Loss	12,772	12,772	12,293	5,389
Consumer, Other Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Nonaccrual	193	193			48
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0			$ 85
Financing Receivable, Allowance for Credit Loss	$ 1,861	$ 1,861	$ 1,941	856
Total loans | Accounting Standards Update 2016-13 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Allowance for Credit Loss				$ 5,769